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August 2021 Resource available to assist with vulnerability assessments in Miami-Dade County Katie Hagemann Resilience Program Manager, Adaptation Office of Resilience, Miami-Dade County 2 Miami-Dade County’s Vulnerability Assessment of Critical Facilities ADD A FOOTER 3 ADD A FOOTER 4 Resource: Miami-Dade County’s Vulnerability Viewer link ADD A FOOTER 5 ADD A FOOTER 6 ADD A FOOTER 7 ADD A FOOTER 8 ADD A FOOTER 9 ADD A FOOTER 10 ADD A FOOTER 11 ADD A FOOTER 12 ADD A FOOTER 13 Resource: UF’s SLR Sketch Planning Tool link ADD A FOOTER 14 ADD A FOOTER 15 ADD A FOOTER 16 Resource: Flood Factor link ADD A FOOTER 17 ADD A FOOTER 18 ADD A FOOTER 19 ADD A FOOTER 20 Resource: Climate Central link ADD A FOOTER 21 ADD A FOOTER 22 ADD A FOOTER 23 Resource: Local Mitigation Strategy (LMS) link ADD A FOOTER 24 ADD A FOOTER 25 link Resource: Sea Level Rise Strategy link ADD A FOOTER 26 27 ADD A FOOTER 28 Deploy Temporary Flood There are manyPanelsflood-proofing measures that can be What are the advantages? deployed to protect assets from flood damage. In many • Flood panels can be cost-effective for businesses as a cases, “dry flood-proofing measures,” or measures intended temporary solution to short-term events. to keep water out of a structure, are used to protect built assets from temporary events like storm surge or rain- • Flood panels are a less expensive method to keep water induced flooding. out of a structure in the short-term while longer-term solutions are implemented. One example of dry flood-proofing is temporary flood panels. They are used on many buildings in Miami-Dade County to What are the limitations? keep water out during short-term events. The panels are • Flood panels are a short-term solution for occasional mobile barriers deployed to protect a building or other asset flooding events; they will not work against regular tidal from short-term flooding events. These panels, which are flooding or sea level rise. typically put in place just before a storm, help temporarily keep the water out. • Flood panels are most appropriate for commercial How does it help us? businesses. Flood panels can be temporarily deployed to protect • Flood panels cannot be used to bring a substantially vulnerable buildings from short-term flooding events, such damaged or substantially improved residential structure as storm surge from an incoming hurricane. The panels into compliance with local floodplain management themselves create a seal around the building, thereby ordinances. blocking or reducing the amount of water that can get in. Flood panels provide a cheaper and more flexible option • To be effective, users must know many things before the compared to other flood-proofing tools such as raising a storm hits: 1) where the flood panels are located; 2) what building or installing permanent flood doors. However, they tools are needed to deploy them; and 3) how to install are a temporary fix and must be deployed and then removed them. to enter a structure after a flooding event. Flood panels must also be stored in an accessible place, and the user must • Flood panels can require significant storage space, time and labor to deploy. Preparing the County Courthouse Whereknow howwillto deployit work?the panels for them to be effective. How much does it cost? Temporary flood panels work best to reduce risks from Costs vary depending on level of flood protection. One study occasional events like tropical storms. They are not estimates $1,500 per linear foot of flood panel. Temporary flood panels also incur labor and storage costs. designed to permanently keep out water, so they cannot be Miami-Dade County staff install temporary flood panels around the Miami-Dade County Courthouse before Hurricane used to address sea level rise. They may be a necessary According to an analysis by the US Army Corps of Matthew in 2017. intermediate tool while longer-term solutions, like raising or Engineers, the average cost of flood-proofing an entire redeveloping a building, are implemented. Under current building with temporary flood panels is $151,000 for Date: Deployed before storms | Location: Miami-Dade County Courthouse flood insurance regulations, panels can only be used for structures between Temporary flood panels can be installed before a storm to help keep water out of certain spaces. They cannot be used commercial buildings, not for private homes. Additionally, 0 and 20,000 square feet, and $357,000 for structures as a permanent water barrier, but they are very helpful to protect against temporary flooding from a storm. Miami- Dade these panels can be labor intensive to install; therefore, they Wherebetween can30,000 youto 100 learn,000 more?square feet. County uses temporary flood panels to protect certain buildings when hurricanes are approaching. are most appropriate for institutions with sufficient staff. • Federal Emergency Management Agency – Dry Flood- proofing Measures Miami-Dade County’s Internal Services Department uses temporary flood panels to protect the basement of the County Courthouse on Flagler Street. The flood panels are made of aluminum and fit into permanent anchor points outside of the building. It takes two professionals to install each panel. When preparing the building for a hurricane, the panels are the last protective measure to be installed. What hazards does it Flood panels only work in the short-term to keep water out during events like address? hurricanes Because they block access to the space they are protecting, the panels are deployed just before staff members Shoreline Tidal Groundwater evacuate the building before a hurricane. During a storm, the panels help minimize the flow of water that comes into the Storm Surge Erosion Flooding Flooding basement from the streets. Because they minimize the flow of water into the building, the panels give the sump pumps inside the structure time to pump out the water that does come in. Between storms, the panels are stored on-site and can be used repeatedly during future storms. Stormwater Flooding from Saltwater Waves Flooding Canals Intrusion 154 MIAMI- DADE COUNTY SEA LEVEL RISE STRATEGY | MINI- GUIDE, TOOLS & CASE STUDIES MIAMI- DADE COUNTY SEA LEVEL RISE STRATEGY | MINI- GUIDE, TOOLS & CASE STUDIES 155 Elevate Buildings Elevating buildings involves raising buildings above expected • Elevating buildings reduces longer-term risks from water levels as well as retrofitting them with complementary flooding exacerbated by sea level rise. measures (see Elevating Critical Equipment) to reduce the risk of flooding to the building. Elevating buildings is typically • Elevating buildings allows for roads to be raised new chlorine building most cost-effective for new construction as higher elevations can be designed into the project before construction begins. incrementally as sea levels rise. However, raising existing buildings is technically feasible, but it can be very expensive. Buildings can be elevated on pilings • Elevating a property will likely lead to reduced flood or elevated on fill to increase their height above predicted insurance premiums. flood levels. Elevating on pilings, like we see in some areas of What are the limitations? the Florida Keys, allows water to flow under a structure. Building on fill, like we see in many parts of western Miami- • It is expensive to elevate existing structures. In some Dade County, elevates the entire parcel on top of new soil that cases, the cost may exceed the value of the building. has been mined from other areas. • Elevating on fill can create drainage issues for adjacent How does it help us? properties if stormwater is not retained on site. old chlorine building • Elevating buildings can pose accessibility Elevating on pilings or on fill raises a structure out of the Therefore, buildings may need floodplain. Being above expected flood levels is often the most effective way to protect a building from flood damage. Further, elevators to facilitate access. issues. additional elevated buildings can still have certain materials below the • Elevating buildings can change neighborhoodramps or character. Elevating critical wastewater first livable floor. Like you see in the Florida Keys, it is possible to have materials on the ground level that are designed to break away during storms or let water pass through them. That How much does it cost? infrastructure way, the space can be enjoyed and used between storms for The average cost of elevating existing structures, based on certain purposes, like parking or temporary storage. Federal Emergency Management Agency (FEMA) mitigation grant data is $230,000 per structure based on 192 structures Where will it work? in Florida. According to research by the U.S. Army Corps of Elevating buildings technically works everywhere, though it can Engineers, the average cost of elevating existing structures be more or less feasible depending on the structure type, size, based on market research in New Orleans (with prices Miami-Dade County Water and Sewer Department (WASD) constructed one of their new chlorine buildings to harden against flooding from storm surge, and age. How high a structure should be elevated depends on adjusted to Miami) is approximately $203,000 per structure. sea level rise, and rain- induced events. WASD is one of the first County departments to integrate sea level rise design standards into all their capital its location. In areas that face high storm surge risk and the projects. potential for damaging waves, it is particularly important to Note that these construction costs will vary significantly per elevate buildings. It is very important to note that it is much structure as well as per foundation type. The cost of building Location: Virginia Key more cost-effective to design an elevated building and build it a new building at a higher elevation is to a higher standard than to retroactively elevate an existing 0.25 to 1.5% of total construction costs for private homes The Miami-Dade County Water and Sewer Department (WASD) is designing improvements to their wastewater building or to flood-proof it with water-tight doors and panels.

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